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97 lines
1.7 KiB
C
97 lines
1.7 KiB
C
/*
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* tools/libtxt/edit.c - Editing and rendering
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*
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* Written 2012 by Werner Almesberger
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* Copyright 2012 Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include "libtxt.h"
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static int *do_edit(uint8_t *canvas, int width, int height,
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const struct edit *e, const char **error)
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{
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struct image *img;
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struct font *font = NULL;
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int x = 0, y = 0, max = 0;
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int spc = 1;
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const char *s;
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int xo, yo;
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while (e) {
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switch (e->type) {
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case edit_string:
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for (s = e->u.s; *s; s++) {
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xo = draw_char(canvas, width, height,
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font, *s, x, y);
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yo = char_height(font, *s);
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if (yo > max)
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max = yo;
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x += xo+spc;
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}
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break;
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case edit_font:
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free_font(font);
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img = load_image(e->u.s, error);
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if (!img)
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return 0;
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font = make_font(img, error);
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if (!font)
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goto fail;
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break;
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case edit_spc:
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spc = e->u.n;
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break;
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case edit_xoff:
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x += e->u.n;
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break;
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case edit_xpos:
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x = e->u.n;
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break;
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case edit_yoff:
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y += e->u.n;
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break;
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case edit_ypos:
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y = e->u.n;
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break;
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case edit_nl:
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x = 0;
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y += max+1;
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max = 0;
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break;
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default:
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abort();
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}
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e = e->next;
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}
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fail:
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free_image(img);
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free_font(font);
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return 0;
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}
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void *apply_edits(int width, int height, const struct edit *e,
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const char **error)
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{
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uint8_t *canvas;
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canvas = calloc(1, (width*height+7) >> 3);
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if (!canvas)
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abort();
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if (do_edit(canvas, width, height, e, error))
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return canvas;
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free(canvas);
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return NULL;
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}
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